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Questions in physics

[Answered] Answer the following questions: 1. What do you understand by frictional force? Give example. 2. List the different types of energy.

[Answered] Lesson Goals: Define and calculate. Explain how momentum is. Apply Newton's to momentum.

[Answered] Which statement describes gravity? A. There is no defined unit of measurement for gravity. B. Gravity is the force that pulls objects toward Earth's center. C. Objects that have a small mass will have no gravitational pull. D. Gravitational pull between two objects decreases as the mass of one increases.

[Answered] The atmospheric pressure in a certain area is determined to be 103.36 kPa using a mercury barometer shown in the figure below. (Acceleration due to gravity, g = 10 m/s², and density of mercury, \( \rho \) = 13.6 x 10³ kg/m³) The height to which the mercury column rises is about: A. 76 mm B. 76 cm C. 7.6 m D. 760 cm

[Answered] Ariana is accelerating her car at a rate of 4.6 m/s² for 10 seconds. What was her final velocity? A. 0 m/s B. 2.3 m/s C. 4.6 m/s D. 46 m/s

[Answered] Which of the following correctly identifies a voltage source and its method of developing electric potential? A) Generator: genetic action B) Dry cell: chemical action C) Thermocouple: chemical action D) Primary cell: heat action on a device

[Answered] What is the postulate having to do with the speed of light on which the theory of special relativity is based? A. The speed of light remains the same in all inertial frames of reference. B. The speed of light depends on the speed of the source emitting the light. C. The speed of light changes with change in medium through which it travels. D. The speed of light does not change with change in medium through which it travels. Scientists now believe that at one time, everything existed at one point, which then expanded rapidly outwards to form the Universe as it is today. What is this theory called? A. Big Bang Theory B. Steady State Theory C. Big Crunch Theory D. The Theory of Relativity

[Answered] The initial speed of a rocket is 5 m/s. At the end of each year, the value of the rocket changes by 4 m/s. What will be the value of the rocket at the end of the fifth year? 0. 25 m/s 1. 15 m/s 2. 12 m/s 3. 20 m/s

[Answered] (i) What changes will occur in a specimen on placing it inside a solenoid and increasing H (magnetizing intensity)? (a) Intensity of magnetization decreases. (b) Intensity of magnetization increases. (c) Magnetic susceptibility of specimen increases. (d) Magnetic susceptibility of specimen decreases. (ii) Which one of the following is not a ferromagnetic material? (a) Cobalt (b) Iron (c) Nickel (d) Bismuth (iii) For a diamagnetic material, which of the following option is correct? (a) Magnetic susceptibility < 0 (b) Magnetic susceptibility > 0 (c) Magnetic susceptibility = 0 (d) Magnetic susceptibility = 1 (iv) The property possessed by a ferromagnetic substance only is (a) hysteresis (b) susceptibility (c) directional property (d) attracting a magnetic substance

[Answered] The negative terminal of a battery contains a large reserve of free: A. electrons B. protons C. neutrons D. acid